Relationships between the occurrence of accessory Ge-minerals and sphalerite in Variscan Pb-Zn deposits of the Bossost anticlinorium, French Pyrenean Axial Zone: Chemistry, microstructures and ore-deposit setting

Abstract

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Structural Control on the Formation of Pb-Zn Deposits: An Example from the Pyrenean Axial Zone

“…(III) The Pale Bidau-Argut-Pale de Rase district is located in the northern part of the anticlinorium. Pb-Zn production did not exceed ~7000 t of Zn and ~3000 t of Pb [57]. Three main Pb-Zn districts are recognized in the Bossòst anticlinorium ( Figure 2): (I) The Bentaillou-Liat-Urets district is located in the eastern part of the anticlinorium and was the most productive in the Bossòst anticlinorium,~1.4 Mt at 9% of Zn and 2% of Pb metals [32,33].…”

“…(III) The Pale Bidau-Argut-Pale de Rase district is located in the northern part of the anticlinorium. Pb-Zn production did not exceed~7000 t of Zn and~3000 t of Pb [57]. Pierrefitte anticlinorium is located north of the Cauteret granite and intersected by the Eaux-Chaudes thrust (ECT; Figure 1).…”

“…It intersects S 0 -S 1 cleavage and former Type 2a stratabound mineralization. It has been recognized in the Pale Bidau-Argut-Pale de Rase districts [57] and Arre-Uzious-Anglas districts. It appears in a limited number of deposits in the PAZ.…”

Variscan U-Th-Pb age for stratabound Pb-Zn mineralization in the Bossòst dome (Pyrenean Axial Zone)

“…2A-B). Based essentially on macrostructural concordance between mineralization and stratification, ore formation has been interpreted in many studies as Ordovician or Devonian in age and as the result of syngenetic processes with only minor local remobilization during the later Cugerone et al, 2018a;Cugerone et al, 2018b;García-Sansegundo and Alonso, 1989). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)…”

“…Arre-Anglas district) are the two main documented mineralization events (Fig. 1B) (Bois et al, 1976;Castroviejo Bolibar and Serrano, 1983;Cugerone et al, 2018b;Cugerone et al, 2018a;Munoz et al, 2016;Nicol et al, 1997;Reyx, 1973). The largest known Pb-Zn ore bodies occur in stratabound veins hosted in metasedimentary rocks (clastic or carbonate-marble rocks).…”